code: def test_insat3d_backend_has_1km_channels(insat_filename):
      """Test the insat3d backend."""
      res = open_dataset(insat_filename, resolution=1000)
      assert res["IMG_VIS"].shape == shape_1km
      assert res["IMG_SWIR"].shape == shape_1km
  
imports: import os
  from datetime import datetime
  import dask.array
  import h5netcdf
  import numpy
  import pytest
  from satpy import Scene
  from satpy.readers.insat3d_img_l1b_h5 import CHANNELS_BY_RESOLUTION, LUT_SUFFIXES, Insat3DIMGL1BH5FileHandler, get_lonlat_suffix, open_dataset, open_datatree
  from satpy.tests.utils import make_dataid
label_desc: Use image node_id 5 for calling a global function with example usage: test_insat3d_backend_has_1km_channels(insat_filename) without return types